Wouldn't this be an awesome idea if they made it so you can infuse into the class items from the first two raids? There are also some awesome ghost ideas for Crota and VoG.
The Crota shell could be Hive themed and have spikes on the top that resemble Crota's kind of "natural" crown that he has "kissed by a princess". Or it could be black and have Wizard smoke effects to relate to the very dark first part of the Crota raid "Embrace the darkness". The VoG shell could be made of glass like Atheon's portal "mirror, mirror on the wall...". You could even have a gorgon style ghost! "If looks could kill".
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But they don't have ghost shells and class items